JPH11247018A - Mechanism for opening and closing shield in helmet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the extent of protrusion of a shield from the surface of a helmet by attaching two centers of rotation of the shield in both left and right sides of the helmet, changing over the centers of rotation in the course of rotation of the shield and preventing the shield from separating from the hat body surface of the helmet. SOLUTION: This mechanism is obtained by supporting shafts 3' on both lateral parts of a shield 3 for closing a window hole of a helmet 1 on the outside of the helmet 1 with supporting shafts 4 and 5 which are two centers of rotation so as to be freely rotatable in the vertical directions. The supporting shaft 4 is fitted into a tracklike hole 6 and the supporting shaft 5 is fitted into a circular arc hole 7. The supporting shaft 4 preferably has an elastic piece 8 producing spring actions in the radial direction. The shaft 5 is moved so that the distance between the centers of the shafts 4 and 5 shown in the figure describes a circular arc always equal to the distance between the centers of the shafts 4 and 5 when the shaft 4 is located at the right end of the hole 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield opening and closing mechanism for a helmet.

[0002]

2. Description of the Related Art A helmet (full face type helmet, jet type helmet, etc.) mounted on the head when riding a vehicle (motorcycle, four-wheeled vehicle, etc.) has a shield that closes an opening formed on the front face. Mounted as possible. The mounting structure will be described with reference to FIG. 5 in the case of a full face type helmet. The mounting portions 100 ′ on the left and right sides of the shield 100 are rotatably supported on the left and right sides of the helmet 101 by the support shaft 102, and the shield has An arc hole 103 for restricting a rotation range is provided on the support shaft 102.
The hole 104 is formed at a predetermined angle around the hole 104 to be fitted. That is, the shield is rotatably supported by a single rotation center with respect to the helmet, and its rotation trajectory draws a certain circle when viewed from the side.

[0003]

Normally, when the shield is closed, the inner surface of the shield is in close contact with a rim rubber attached to the edge of the opening (window hole) of the helmet, and the shield is opened from that position. To do so, the shield must be pivoted away from the helmet surface to combat the friction of the edging rubber.

In other words, it is necessary to set the rotation center of the shield above the center of the outer shape (substantially circle) of the cap as viewed from the side. However, as it is, the shield moves away from the surface of the cap as the shield is pivoted upward to open the opening. Further, in order to prevent the shield from being too far from the surface of the cap with the opening being opened, the turning radius of the shield must be shortened and the center of rotation must be set forward of the center of the outer shape of the cap. Setting the center of rotation of the shield while satisfying the above conditions has caused a reduction in the degree of freedom in the shape design of the helmet.

[0005] The present invention has been made in view of the above-mentioned problems of the prior art.
It is an object of the present invention to provide a mechanism for opening and closing the shield, which is in close contact with the rim of the opening when the shield is closed and which is not too far from the helmet surface when the shield is fully open.

[0006]

In order to solve the above-mentioned problems, the technical means adopted by the present invention is to move the shield from the state in which the opening is closed to the state in which the shield moves to the top side to open the opening. It is characterized in that the rotation is supported by two rotation centers and the rotation center is switched between the first half and the second half of the rotation.

The mechanism in which the two rotation centers are switched as a continuous series of movements includes a rotation center A for carrying out the first half rotation, and a rotation center A
, An arc hole 7 for regulating a rotation range (B-B ') of a predetermined angle around the center is opened, and a second half rotation range (A-A') is centered on the rotation end side B 'in the arc hole 7. A hole to be determined is continuously opened at the rotation center A.

According to the above-mentioned means, in the fully closed state in which the shield closes the opening of the helmet, the shield is in close contact with the edge rubber of the opening, and in the fully open position of the shield that opens the opening, the shield is placed on the surface of the helmet. It is held at a close position, and the amount of protrusion from the surface of the helmet can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a helmet equipped with a shield opening / closing mechanism according to the present invention. Outside a full-face type helmet 1, mounting portions 3 ′ on both sides of a shield 3 for closing a window 2 formed in the helmet 1. Are rotatably supported in the up and down directions by two support shafts 4 and 5 serving as rotation centers.

The two support shafts 4 and 5 for rotatably supporting the shield 3 move from the "closed" state in which the window 2 of the helmet is closed to the top to "open" to open the window 2. The center of rotation is switched in a series of rotations up to the state described above in a first half and a second half.

The structure will be described below. A track-shaped hole 6 in which the support shaft 4 is fitted into the mounting portions 3 'on both sides of the shield 3, and an arc hole 7 in which the support shaft 5 is fitted are formed. I have. The track-shaped hole 6 is formed continuously with a rotation center A which is engaged with the support shaft 4 and performs the first half rotation, and the rotation center A as a start point and an end point A ′ of the second half rotation range. Things. The other arc hole 7 determines the first half rotation range (B to B ′) around one rotation center A in which the support shaft 4 in the hole 6 fits. The distance L1 and the distance L2 between AB 'are set to be the same. Then, an arc hole 7 for determining the rotation range
The distance L3 between the distance A'B 'connecting the point B' (the end point of the first half rotation range) and the end point A 'of the hole 6 which determines the second half rotation range is the distance L1 between the two points described above. Set the same as L2. That is, L1 = L2 = L3, and different distances are set between A′B.

With the above configuration, the shield 3 shown in FIG.
Is closed, the point 6 of the hole 6 of the mounting portion 3 'is engaged with the support shaft 4, and the point B of the arc hole 7 is engaged with the support shaft 5. When the shield 3 is pivoted upward from the state shown in FIG. 3, the shield 3 is engaged with the support shaft 4 at the point A of the hole 6 and the other point B ′ of the circular arc hole 7 around the support shaft 4.
When the point B ′ of the arc hole 7 engages with the support shaft 5, the rotation about the support shaft 4 ends (see FIG. 4).

When the first half rotation about the support shaft 4 is completed, the shield 3 is rotated with the support shaft 5 as the center of rotation. That is, in a state where the point B ′ of the arc hole 7 engages with the support shaft 5, the other point A ′ of the hole 6 around the support shaft 5.
When the point A ′ of the hole 6 engages with the support shaft 4, the latter half rotation around the support shaft 5 ends, and the shield 3 is fully opened (FIG. 1). , FIG. 2).

In the above-described embodiment, a shaft having an elastic piece 8 in which a spring action occurs in the radial direction is used as the support shaft 4, but this is for holding the shield 3 at an arbitrary opening angle. It is not limited to this. In addition, the hole 6 described above is formed so that the intermediate portion between the point A and the point A ′ is narrower than the diameter of the support shaft 4 so that the engagement with the support shaft 4 is performed with good moderation. The engagement with the point A ′ is performed with good moderation. Furthermore, both the hole 6 and the arc hole 7 are holes for making an arc movement, and are not limited to having or not having a moderation mechanism.

[0015]

According to the present invention, there is provided a shield opening / closing mechanism according to claim 1 of the present invention.
In the fully closed state in which the shield is closed at the opening of the helmet by switching the opening and closing rotation of the shield at the two rotation centers, the shield is tightly joined to the rim rubber of the opening. When moving from the closed state to the open state or back from the open state to the closed state, the shield pivots in a direction that reduces the contact area that pivots while rubbing the helmet's edging rubber, and is close to the surface of the helmet in the fully open position. Held in position and the amount of protrusion from the surface of the helmet is reduced. Further, since the shield is fully closed and fully opened at different rotation centers, the degree of freedom in designing the shape of the helmet can be secured. Further, when the shield is mounted on an off-road helmet to which an eaves are attached, the full opening angle of the shield can be set according to the angle of the eaves, so that when the shield is raised, it is easy to store and hold the shield inside the eaves.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a helmet equipped with a shield opening / closing mechanism of the present invention.

FIG. 2 is an enlarged view showing a main part of the shield of FIG. 1 in a fully opened state.

3A and 3B show a state in which a shield is closed, FIG. 3A is a side view of the same, and FIG. 3B is an enlarged view of an opening / closing mechanism.

4A and 4B show a state in which the shield has been rotated from the state of FIG. 3 to the end point of the first half rotation range, FIG.
FIG. 3 is an enlarged view of an opening / closing mechanism.

FIG. 5 is a partially cutaway side view showing a helmet equipped with a conventional shield opening / closing mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Helmet 2 ... Opening (window hole) 3 ... Shield 4, 5 ... Support shaft 6 ... Hole 7 ... Arc hole

Claims (2)

[Claims] 1. A shield that enables opening and closing from a state in which a front opening of a helmet is closed to a state in which the helmet is moved to a top side and opened by rotation around points provided on both left and right sides of the helmet. During the rotation of the shield from the state where the opening is closed to the state where the opening is opened by moving to the top side of the helmet from the state where the opening is closed, two points each serving as the center of rotation are provided on each of the left and right sides, A shield opening and closing mechanism for a helmet, characterized in that the center of rotational movement is switched from one point to another. 2. The mounting part on both right and left sides of the shield,
The rotation center A responsible for the first half rotation, the hole 6 for determining the end point A ′ of the second half rotation range starting from the rotation center A, and the first half rotation range of the shield around the point A of the hole 6 An arc hole (7) having a predetermined angle to be determined is opened, and said hole (6) is engaged with a spindle (4) fixed to the helmet side, and the arc hole (7) is engaged with a spindle (5) fixed to the helmet side. The opening and closing mechanism of the shield in the helmet described in the above.